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Double stranded virus genomes

Viruses vary in the makeup of their genetic material. Some have double-stranded DNA, but other viruses have genomes composed of single-stranded DNA, double-stranded RNA, or single-stranded RNA. Single-stranded molecules have a single polymer of DNA or RNA that does not form a double-helix and does not base-pair with a complementary polymer. What predictions could you make about base composition in the genomes of these organisms?

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Double stranded virus genomes must have the same numbers of G and C residues, and the same numbers of A and T residues so that these bases can pair ...

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Double stranded virus genomes are characterized.